Confession first: We stopped watching "Bones" regularly somewhere in season 8. It had become less enjoyable for us and the whole Pelant story line went on too long, plus giving him amazing supernatural powers. We have watched episodes from time to time since then. And honestly, I agree with others that it became virtually impossible to listen to Emily Deschanel's voice and delivery change. I don't know whose idea it was, but it was a bad one, IMO.
Anyway, we were fanatical watchers during the first 6 seasons. As well, I have been reading Tempe Brennan books since the beginning. Although this Tempe and her life are vastly different, I think they did a good job carrying the spirit and dynamic in the show. The first four seasons in particular are, for us, excellent overall.
Now for "Aliens in a Spaceship." It's rare to find an episode of television drama that starts on a high note, extends the tension, weaves everything together, and then resolves on a quiet note. Where every word, every gesture, every scene is as meaningful as the others. Everything about this episode does all of that. It shows sides of characters we hadn't known or seen; it brings the team together on a deeper level; it helps individual relationships evolve; and most of all, it's simply an excellent plot, well written and directed, and fully embraced by the cast. I've seen it probably eight times over the years and it never gets old or boring. (As a frame of reference for my tastes, most episodes in season 1, especially those that advance the overall story, deepen the relationships, and/or give the viewer insight into characters' pasts, have remained favorites for me.) Don't miss this one!